Wtf is with everyone hating Kaname? Just because he isnt a stereotypical prince charming anymore, everyone hates him. If anything Kaname isnt Yuki's brother, therefore he is not partaking in anything incestuous and who could blame him for wanting to kill Zero. The guy is in love with Yuki, too.
He loves her dearly as you can see since he went through great lengths just for her, he obviously didnt care if people hated him for it.